package com.mall.authserver.controller;

import com.alibaba.fastjson.TypeReference;
import com.mall.authserver.feign.MemberFeignService;
import com.mall.authserver.feign.ThirdPartFeignService;
import com.mall.authserver.vo.UserLoginVo;
import com.mall.authserver.vo.UserRegistVo;
import com.mall.common.constant.AuthServerConstant;
import com.mall.common.exception.BizCodeEnume;
import com.mall.common.utils.R;
import com.mall.common.vo.MemberResVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import javax.servlet.http.HttpSession;
import javax.validation.Valid;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Controller
public class LoginController {

    @Autowired
    ThirdPartFeignService thirdPartFeignService;

    @Autowired
    StringRedisTemplate redisTemplate;

    @Autowired
    MemberFeignService memberFeignService;

    @ResponseBody
    @GetMapping("/sms/sendCode")
    public R sendCode(@RequestParam("email") String email) {

        //TODO  1、接口防刷

        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + email);
        if (!StringUtils.isEmpty(redisCode)) {
            long redisTime = Long.parseLong(redisCode.split("_")[1]);
            if (System.currentTimeMillis() - redisTime < 60000) {
                // 60秒内，不能再发
                return R.error(BizCodeEnume.SMS_CODE_EXCEPTION.getCode(), BizCodeEnume.SMS_CODE_EXCEPTION.getMsg());
            }
        }

        // 2、验证码的再次校验。存入redis 存入key - email ，value - code  sms:code:xx@email
        String code = UUID.randomUUID().toString().substring(0, 5);

        // long var3 , TimeUnit var5
        // redis 缓存验证码，防止同一个email在60秒内再次发送验证码
        redisTemplate.opsForValue().set(AuthServerConstant.SMS_CODE_CACHE_PREFIX + email, code + "_" + System.currentTimeMillis(), 10, TimeUnit.MINUTES);

        thirdPartFeignService.sendCode(email, code);
        return R.ok();
    }

    @PostMapping("/regist")
    // @Valid : 数据校验
    // BindingResult result：数据校验的结果
    // RedirectAttributes redirectAttributes：模拟重定向携带数据
    // TODO 重定向携带数据，利用session原理，将数据放在session中。
    //  只要跳到下一个页面取出这个数据以后，session里面的数据就会删掉
    //  1、分布式下的session问题
    public String regist(@Valid UserRegistVo vo, BindingResult result,
                         RedirectAttributes redirectAttributes) {
        if (result.hasErrors()) {
            Map<String, String> errors = result.getFieldErrors().stream().collect(Collectors.toMap(FieldError::getField, FieldError::getDefaultMessage));
//            model.addAttribute("errors",errors);
            redirectAttributes.addFlashAttribute("errors", errors);
            // Request methods 'POST' not supported
            // 用户注册 -> /regist[post] --> 转发到/reg.html（路径默认映射都是get方式访问的，而现在这个方法是post）
            // 校验出错，转发到注册页
//            return "forward:/reg.html";

            // 校验出错，转发到注册页
            return "redirect:http://auth.gulimall.com/reg.html";
        }

        // 真正注册。调用远程服务进行注册
        // 1、校验验证码
        String code = vo.getCode();
        String redisCode = redisTemplate.opsForValue().get(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getEmail());
        if (!StringUtils.isEmpty(redisCode)) {
            if (code.equals(redisCode.split("_")[0])) {
                // 验证码通过
                // 删除验证码；令牌机制
                redisTemplate.delete(AuthServerConstant.SMS_CODE_CACHE_PREFIX + vo.getEmail());
                // 真正注册。调用远程服务进行注册
                R r = memberFeignService.regist(vo);
                if (r.getCode() == 0) {
                    // 成功
                    return "redirect:http://auth.gulimall.com/login.html";
                } else {
                    Map<String, String> errors = new HashMap<>();
                    errors.put("msg", r.getData("msg",new TypeReference<String>() {}));
                    redirectAttributes.addFlashAttribute("errors", errors);
                    return "redirect:http://auth.gulimall.com/reg.html";
                }
            }
        }
        Map<String, String> errors = new HashMap<>();
        errors.put("code", "验证码错误");
        redirectAttributes.addFlashAttribute("errors", errors);
        // 校验出错，转发到注册页
        return "redirect:http://auth.gulimall.com/reg.html";
    }

    @GetMapping("/login.html")
    public String loginPage(HttpSession session){
        Object attribute = session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(attribute == null) {
            // 没登录
            return "login";
        }
        return "redirect:http://gulimall.com";
    }

    @PostMapping("/login")
    public String login(UserLoginVo vo, RedirectAttributes redirectAttributes, HttpSession session){

        // 远程登录
        R login = memberFeignService.login(vo);
        if(login.getCode() == 0){
            MemberResVo loginUser = login.getData("data", new TypeReference<MemberResVo>() {
            });
            // 成功,放到session中
            session.setAttribute(AuthServerConstant.LOGIN_USER,loginUser);
            return "redirect:http://gulimall.com";
        }
        Map<String, String> errors = new HashMap<>();
        errors.put("msg", login.getData("msg",new TypeReference<String>(){}));
        redirectAttributes.addFlashAttribute("errors",errors);
        return "redirect:http://auth.gulimall.com/login.html";
    }
}
